WO1992013730A1 - Indicateur de la pression anormale et normale d'un pneu pendant la conduite ou l'arret d'un vehicule - Google Patents

Indicateur de la pression anormale et normale d'un pneu pendant la conduite ou l'arret d'un vehicule Download PDF

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Publication number
WO1992013730A1
WO1992013730A1 PCT/GR1992/000001 GR9200001W WO9213730A1 WO 1992013730 A1 WO1992013730 A1 WO 1992013730A1 GR 9200001 W GR9200001 W GR 9200001W WO 9213730 A1 WO9213730 A1 WO 9213730A1
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WO
WIPO (PCT)
Prior art keywords
metallic
strips
strip
vehicle
wheel
Prior art date
Application number
PCT/GR1992/000001
Other languages
English (en)
Inventor
Nicolaos Tsagas
Original Assignee
Nicolaos Tsagas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nicolaos Tsagas filed Critical Nicolaos Tsagas
Priority to AU12205/92A priority Critical patent/AU671583B2/en
Priority to JP50405592A priority patent/JP3218244B2/ja
Priority to DE69214619T priority patent/DE69214619T2/de
Priority to EP92904299A priority patent/EP0550701B1/fr
Publication of WO1992013730A1 publication Critical patent/WO1992013730A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0496—Valve stem attachments positioned outside of the tyre chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0427—Near field transmission with inductive or capacitive coupling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0427—Near field transmission with inductive or capacitive coupling means
    • B60C23/043—Near field transmission with inductive or capacitive coupling means using transformer type signal transducers, e.g. rotary transformers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0433—Radio signals
    • B60C23/0447—Wheel or tyre mounted circuits
    • B60C23/0452—Antenna structure, control or arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0494—Valve stem attachments positioned inside the tyre chamber

Definitions

  • An indicator of the abnormal and normal pneumatic tyre pressure during driving or stopping of a vehicle is an indicator of the abnormal and normal pneumatic tyre pressure during driving or stopping of a vehicle.
  • the present invention relates to the apparatus for indicating to the driver the abnormal and normal pneumatic tyre pressure during driving or stopping of the vehicle.
  • This apparatus consists of a special electronic circuit producing alternating voltages of definite frequency shape and amplitude which are applied to a special system of metallic strips placed on the rotating frame of the wheel and non-rotating part in a free space close to the brakes and to the axle of the wheel. These strips are operating as air capacitors of the circuit to transfer the signals from the rotating wheels to the vehicle's control panel, when a special pressure gauge sensor closes the circuit.
  • This circuit operates with a battery (accumulator) which can be connected with the vehicle's battery.
  • This device is not using a system of solid conducts (carbon brushes), where the flow of the alternating current from the rotating wheel to the non-rotating part of the vehicle, can take place by using either a capacitive coupling or an inductive coupling.
  • This alternating current can also flow by applying either alternating high voltage or direct high voltage between two special electrodes placed on the rotating frame of the wheel and the non-rotating part of the vehicle, in a close distance between each other.
  • This device can operate as a safety apparatus indicating the dangerous limits of the pneumatic tyre pressure and therefore the damage of the tyres can be avoided.
  • An. USA patent No 3,930,223 DEC.30.1975 has been awarded to to N.F.Tsagas and an E.P. Application No 0345 199. 30.3.89 has been published for another type of the present invention.
  • Indicators of the pneumatic tyre pressure of various types have been invented in the past, which have different disadvantages like, the use of solid conducts (carbon brushes) which were destroyed by the time, the use of small batteries placed on the rotating wheels was a problem for checking them, the use of pneumatic pressure gauges placed on the wheels as sensors were of big size and expensive and also the use of a system which was not working under bad weather conditions.
  • the aim cf the present invention is to get around and erase all these disadvantages which can be faced by using a number of metallic strips of proper shape which are placed on the rotating frame of the wheel and on the non-rotating part near the brakes and the axle of the wheel and they form one or two plane capacitors or a combination of plane and cylindrical capacitors for each wheel.
  • a pressure gauge sensor of a proper form can be used, so that its flexible membrane can have the ability to make displacements in an easy way in case it comes in contact with one of the two terminals of the sensor and closes the circuit.
  • the pressure gauge sensor is of a simple construction made by durable, light and not expensive material and can be applied to already existing valves of the wheels.
  • the sensor can be applied in a permanent valve which can be added on the back side of the matallic rim of the wheel, especially made for those pressure gauges, in a hiding place which can not be seen by an outside observer.
  • the sensor consists of one durable resilient rubber or metallic membrane of good elasticity which can be displaced along its axis and the amplitude of this displacement depends on the tyre pressure (conversion of pressure into mechanical displacements of membrane) and therefore the sensor can play the role of a switch which, in case of abnormal tyre pressure, connects electrically either the rotating metallic strip with the metallic rim of the wheel or the two rotating metallic strips each other.
  • various other sensors could be used which consist of closed curved tubes or cylindrical tubes with very thin walls which form foldings of wavy shape like bellows or some special materials of which their ohmic resistance is varied according to the applied air pressure.
  • the special electronic circuit can produce alternating voltages of certain characteristics which are applied between the rotating and non-rotating matallic strips, so that an alternating current is flowing in the circuit when the pressure gauge sensor closes the circuit in case of the abnormal tyre pressure. Then the alternating current can activate a light emitting diode or a loudspeaker on the driving control panel. It is possible, except for the indication of normal and abnormal tyre pressure, to have also an indication of the coutinous air pressure in the tyres of the vehicle.
  • the advantage of this invention is mainly the transmission of the information of abnormal and normal tyre pressure from the rotating wheels to the cabinet of the driver, without using a solid contact and therefore tp be worn out because of the friction. Hence the use of a conducting system, as carbon brushes which must be substituted quite often, is avoided.
  • the pressure gauge sensor and the circuit are simple and not cos ⁇ tly.
  • the vehicle's battery can be used for the operation of the circuit. From the above it is obvious that the present invention has many advantages.
  • Figure 1 is one view of a part of the device and a view of a part of the wheel and a part of the vehicle where a part of the device is placed.
  • the device consists of a system of metallic strips which are placed in a special way in a free space close to the brakes and to the rotating axle of the wheel, of a pressure gauge sensor and of an electronic circuit.
  • the rotating metallic strip can cover the round edge of a circular disk made by insulating material which is fastened on the metallic disc base of the axis of rotation, where the brake drum or brake disc and the metallic rim of the wheel are fastened.
  • the non-rotating metallic strip which surrounds circumferentially the first strip is placed in the interior of a cavity of another insulating material which surrounds the first insulating material.
  • the cavity has a shape of annular canal.
  • the two strips are very close without making contact with each other and they form a combination of a cylindrical and two plane capacitors.
  • the third metallic strip surrounds circumferentially the second strip and it is the shielding of the second strip to avoid parasitic current.
  • the electronic circuit is an oscillator with a current amplifier and a voltge transformer which can produce alternating voltages of definite form and frequency which are applied to the first and second metallic strip, so that an alternating electric current can flow when the sensor closes the circuit.
  • Figure 2 gives the general principle of the device operation in block diagrams for the electronic circuit. A part of the annulus of the third metallic strip is also shown in this figure by the broken lines. The annuli of the first and second strip are not shown in figure 2.
  • Figure 2 also shows the way of connection of the first metallic strip with the circuit through the sensor which is earthed with the metallic rim of the wheel and how the third and second metallic strip are connectred through a coaxial cable.
  • Figures 3a and 3b give another principle of the device operation, wnere two rotating metallic strips can form with two non-rotating strips either one cylindrical and one plane capacitor or two plane capacitors respectively.
  • a main alternating current can flow in the electronic circuit presented by block diagrams, when a pin of the sensor is contacting any one of the two sensor's terminals and hence connecting electrically the two rotating metallic strips.
  • the arrangement (setting) of the metallic strips, in figures 3a and 3b could be different depending on the free space available close to the drum and disk brakes for each type of the vehicle's wheels.
  • Figure 4. gives the simple principle of the device operation in block diagrams referring to figure 3b.
  • the disadvantage of the appearance of the electrical resistances due to the lubricant covering the globules of the ball-bearing during the vehicle's motion can be avoided in the last two cases of operation with two capacitors.
  • This electrical resistance appears in the cases referring to figures 1 and 2 where the metallic strips compose only one capacitor and the signal is transmitted throough the ball-bearing.
  • Figures 5.1, 5.2, 5.3, 5.4, 5-5, 5.6, 5.7, 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15, 5.16, 5.17, 5.18, 5.19, give various views of pressure gauge sensors.
  • One durable rubber membrane of certain thickness and elastic properties can close air-tightly a small volume which communicates with the interior of the tyre.
  • the elastic membrane expands or contracts proportionally to the air pressure and therefore increasing or decreasing its curvature, where the sensitivity is depending on the area of the membrane surface.
  • the rubber membrane can contain internally a thin steel wire with curvatures to strengthen (reinforce) the elasticity of the rubber.
  • a thin electrode of good conductivity and special shape is fastened on the surface of the other side of the membrane.
  • This electrode can be also connected with the steel wire for strengthening and conduction with one of the rotating metallic strips.
  • the electrode can be displaced along the axis of the pressure gauge sensor according to the pressure and in between two other special electrodes which are in an adjustable distance. These electrodes can be connected to the metallic rim of the wheel in the case of using only one capacitor of the matallic strips.
  • the rubber membrane it is possible for the rubber membrane to be substituted by a metallic membrane with elastic properties.
  • curved metallic tubes properly shaped which have closed one of their ends and cylindrical tubes with very thin walls which form foldings of wavy shape like bellows can be used to device pressure gauge sensors.
  • the elastic properties of a compressed gas which is contained in a little chamber can be also used for making pressure gauge sensors.
  • the displacements of a small piston (with a flange on its perimeter pressed by a spring circumferentially all the way out) which is balanced by air pressure on one side and bf a spring frame on the other side can be used as a pressure gauge sensor.
  • Figure 6 gives various waveforms of the alternating voltages which are applied between the rotating and non-rotating strips which form the plates of the capacitors. It is important to use the proper frequency, amplituded and waveform of the alternating voltage in order to minimize the parasitic current. A way to eliminate the unwanted signals is to apply high frequency alternating voltages of different characteristics to the nonrotating strips and use bandstop filters.
  • Figure 7 gives a part of the electronic circuit of figure 1 in which a voltage comparator has been added in order to stop the parasitic currents to activate the LED of the circuit.
  • a comparator can be used, after the high -Q notch filter and the stage of a half way rectifier which gives an output of square train whenever the input signal is falling below a certain level which is determined by one trimmer.
  • Figure 8 gives another arrangement of the invention where the metallic strips have been substituted by an electrode pin and one metallic annulus.
  • the capacity coupling has been substituted by a coupling which is performed by electric discharges between the electrode pin and the metallic annulus when a high voltage is applied.
  • Figure 9 shows the cross sections which can have the metallic annulus of figure 8. These cross sections can be: circular, triangular, rectangular and a combination of the above cross sections.
  • Figure 10 shows an arrangement which can be used to control more than one wheels. This can be achieved by the use of circuits of the previous figures and one sampler apparatus.
  • this apparatus basically consists of a pressure sensor (1), a system of metallic strips (2,3,4) or (50, 51 ,52,53) or (56, 57, 58, 59) , high frequency oscilllators with or without a frequency divider producing pulses (19), a current amplifier (42), a transformer or an amplifier and properly tuned filters including a high-Q notch filter(41) which permits the fundamental frequency of the pulse train to pass in order to convert the square train to a sinusoidal waveform, a half wave rectifier and a voltage comparator (40) which converts the sinusoidal signal to the D.C.
  • the comparator gives an output of square train whenever the input signal falls below a certain level which is determined by a trimmer, an indicator like a LED(5) for each wheel or loudspeaker (11) or a microamperometer (8), two variable power resistors (9.21) a power resistor (12), cables(7,6) a shielding (13) and an isolated conductor (22) which absorbs parasitic current.
  • the apparatus can indicate the unsafe limits of the tyre pressure via a light (5) or an audio signal(11) using a different voltage comparator circuit (105,106,107).
  • the pressure gauge sensor (1) which works as a circuit's switch can connect electrically either the metallic strip (2) with the ground(10) that is the metallic frame of the wheel(24) or it can connect also electrically the two rotating metallic strips (56,57).
  • the metallic frame of the wheel is connected electrically with the metallic frame of the vehicle through the ballbearing and axle of rotation (34,30).
  • the metallic strip(2) which is a circular annulus with a cross section of shape "II” is applied circumferentially on the insulating disc (29) which is fastened by the screws (32) on the metallic disk of the axle (30) where the drum or disc brake (25) and the metallic frame of the wheel (24) are fixed.
  • the centre of the disc(29) coincides with the axle of rotation (30) of the wheel.
  • the metallic strip (2) must cover enough area of the disc (29) so as to give sufficient capacitance of the capacitor (2,3).
  • the non-rotating metallic strip (3) which surrounds the metallic strip (2) circumferentially, is mounted inside the "II" shaped annular channel of an insulating circular annulus (28) which is fastened on the base (33) .
  • the metallic strips (2,3) form a capacitor which is a combination of a cylindrical and two plane capacitors.
  • the metallic strips (2) and (3) must not make contact between each other and their distance between them must be very small so that the capaci tance can be sufficiently bigger than the parasitic capacitances.
  • the tnird metallic strip(4) surrounds with a larger area the second metallic strip (3) circumferentially and in between them a thin layer of insulating material is inserted.
  • the strip (4) constitutes the shielding of the strip (3) for minimizing the parasitic capacitances during the normal tyre pressure when the sensor does not close the circuit to connect the strip (2) with the rim (24) or to connect the strips (56) and (57) electrically.
  • connection wires are very thin and covered by insulating material of very low dielectric constant.
  • the centre wire (7) of a coaxial cable (7,6) connects the strip(3) and the LED(5) which is connected in parallel with the resistor (12) and in series with a loudspeaker (11), a digital or analog indicator (8), a variable power resistor (9) and with the one end of the secondary coil (14) of the high frequency and high voltage transformer (13,15,16).
  • the indicators (8) and (11) are not necessary while the LED(5) can be driven by the comparator (106).
  • the metallic strip (4), the conductor(6) and the thin metallic surface (13) constitute the shielding of all surrounded by them parts of the apparatus, for reducing the currents due to the parasitic capacitances.
  • the isolated conductor (22) absorbs a big persentage of the parasitic currents which depends on the variable resistance (21) and the size of the conductor (22).
  • all parts of the apparatus must not be close to the metallic frame of the vehicle.
  • the coils (14,16) must not be close to each other.
  • the core of the transformer (15) is a ferrite of special permeability.
  • the other end of the coil (14) can be connected with the ground through a diode or a resistor or a capacitor.
  • the transformer (14,15.16) can be substituted by a set of properly tuned filters (41 ) including a high-Q notch filter in order to convert the square train to a sinusoidal wave form.
  • the strip (3) is also divided into two similar strips (52) and (53) which together with the above strips (50) and (51) respectively can form two capacitors a cylindrical capacitor (50,52) and a plane one (51,53).
  • the area and the position of these strips are chosen properly to have sufficient capacitance and minimize the parasitic current.
  • the strip (2) is divided into two concentric plane annular strips (56) and (57).
  • the strip (3) is also divided into two concentric plane annular strips (58) and (59) which can form two plane capacitors (56,58) and (57,59) with the strips (56) and (57).
  • a proper area and position of the above strips (56,58,57,59) must be chosen.
  • the strips must not be very close to the metallic parts of the wheel, the distance between the plates of the capacitors must be as small as possible and the area of the plates must be as larger as possible.
  • the strips (56,57) and (58,59) are based on thick insulating layers with small dielectric constant (123) and (124) which are fixed on the brake drum (25)and on the non rotating base (125) respectively.
  • the sensor (1) which operates as an electric switch connects electrically the strip (50) with the strip (51) or the strip (56) with the strip (57) and alternating current flows in the circuit (53,51,54,1,55,50,52,40,41,19,20) which activates the stage (40) so as to give light or sound.
  • the stage (40) can or can not have arrangement with the circuit of the comparator (105,106,107).
  • a transformer (41 ) which is not necessary can increase the alternating voltage of the oscillator (19). Proper waveforms, frequencies and amplitudes must be found in order to avoid parasitic capacitances.
  • the gap between the capacitors (52,50) and (51,53) or between (58,56) and (57,59) must be longer than the distance between the capacitors plates.
  • the capacitance of the capacitors (50,52) and (51,53) or (56,58) and (57,59) can obtain two different values which depend on the position of the switch sensor (1) if it is open or closed.
  • the system of metallic strips is used as a timing capacitor in an oscillator (first stage of the circuit) which can produce a proper frequency in each case (on-off).
  • the high frequency oscillator and the frequency divider (19) produce square train which can pass from an amplifier and properly turned filters including a high -Q notch filter (41) which permits the fundamental frequency of the train to pass in order to convert the square train to a sinusoidal wave form.
  • the filter is designed in such a way so that one of the two frequencies falls in the gap of the notch filter while the second frequency falls outside. The result is in the output of the filter that a necessary distinction (discrimination) between the two frequencies takes place since the first frequency which falls in the gap, passes with very high attenuation.
  • the next stages (40) is a half wave rectifier, a voltage comparator and a monostable multivibrator in which the rectifier converts the sinusoidal signal to the D.C.
  • the comparator gives an output of square train whenever the input signal falls below a certain level determined by a trimmer and the monostable multivibrator increases the amplitude of the pulses train of the comparator output.
  • This multivator is implemented by using a proper timing circuit and its output drives an indicating LED.
  • the capacity coupling can be substituted by another coupling which is an induction coupling or an electric discharge coupling.
  • the metallic strips (3,2) are substituted by an electrode pin (111) and an electrode metallic annulus (112) or by reverse way.
  • a current can flow in the circuit only in the case of abnormal pressure in which the metallic annulus (112) is earthed to the chassis and there is an electric discharge between the electrodes (111,112) due to the applied voltage.
  • the flowing current in the circuit can activate a light or audio indicator.
  • the rest of the operation of the electric circuit is the same as in the case of the capacity coupling.
  • a sampling frequency regulator (122) and a sampler apparatus (121) can be used so that all the wheels one after the other can be controlled continuously many times per minute.
  • a separate independed circuit for each tyre can be used to reduce parasitic currents .
  • Each one of these independed circuits can be placed in a non-rotating position near to each wheel for reducing parasitic currents. All the cables must be not close to the metallic frame of the vehicle and must be covered by a thick insulating material with very low dielectric constant so that their capacitance with the chassis to be as small as possible. Any one of the independed circuits , when is activated, produces a signal which can be transferee to the vehicle's control panel through cables to activate its own corresponded LED.
  • the signals can be amplified if there is a significant drop of voltage due to the distance of the wheels and the above independed circuits from the vehicle's control panel where all the corresponded indicating Light Emission Diodes are positioned. There is a range of high frequency (kHz ⁇ MHz) where the parasitic currents are reduced significantly and this is due possibly to some characteristics of the surrounding metallic frame of the wheel which can net follow the fast changes of high frequency oscillations .
  • Two separate oscillations with common earth can also be produced by (19) and compared by (4.0) so that the oscillation (126) which is applied to the strip (58) can be of a different or same high frequency (kHz ⁇ MHz) of different or same waveform and of different or same amplitude than the oscillation (127) which is applied tc the strip (59) .
  • the separation gap between the strips (58) and (59) must be long enough for reducing the parasitic capacity coupling between these strips .
  • the gap between the strips (56) and (57) must also be large.
  • the insulating materials (123) and (124) which are the base of the strips (58, 59, 56, 57 ⁇ must have very small dielectric constant and sufficient thickness so that these strips must be in a long distance from the adjacent metallic frame.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

Un dispositif pour contrôler la pression d'un pneu pendant que le véhicule se déplace peut fonctionner à l'aide de: deux bandelettes métalliques circulaires complètes (56, 57) placées sur une surface isolée de la face interne d'un tambour de frein (25) ou sur une surface isolée d'un frein à disque; deux bandelettes métalliques (58, 59) placées sur une partie non rotative du véhicule formant deux bandelettes circulaires complètes (58, 59); un détecteur à jauge de pression (1) et des circuits produisant des signaux électroniques (19, 40, 41). Les bandelettes non rotatives (58, 59) sont placées parallèlement aux bandelettes rotatives (56, 57) et à proximité immédiate de celles-ci de manière à former un couple de condensateurs à air (56, 58) (57, 59). Les circuits électroniques (19, 40, 41) produisent des tensions alternatives haute fréquence qui sont appliquées aux armatures des condensateurs (56, 58) (57, 59). En cas de pression dangereuse du pneu, le détecteur (1) ferme le circuit, un courant alternatif circule et un dispositif d'avertissement est actionné. Le courant circulant ainsi dans le circuit de condensateur ne passe pas à travers les roulements de roue (34).
PCT/GR1992/000001 1991-02-08 1992-02-06 Indicateur de la pression anormale et normale d'un pneu pendant la conduite ou l'arret d'un vehicule WO1992013730A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU12205/92A AU671583B2 (en) 1991-02-08 1992-02-06 Pneumatic tyre pressure indicator
JP50405592A JP3218244B2 (ja) 1991-02-08 1992-02-06 自動車の走行又は停止の間空気タイヤの異常な圧力及び正常な圧力を指示する指示装置
DE69214619T DE69214619T2 (de) 1991-02-08 1992-02-06 Anzeigegerät für den abnormalen und normalen reifendruck während des fahrens oder des anhaltens eines fahrzeuges
EP92904299A EP0550701B1 (fr) 1991-02-08 1992-02-06 Indicateur de la pression anormale et normale d'un pneu pendant la conduite ou l'arret d'un vehicule

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GR91100069 1991-02-08
GR910100069 1991-02-08

Publications (1)

Publication Number Publication Date
WO1992013730A1 true WO1992013730A1 (fr) 1992-08-20

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Application Number Title Priority Date Filing Date
PCT/GR1992/000001 WO1992013730A1 (fr) 1991-02-08 1992-02-06 Indicateur de la pression anormale et normale d'un pneu pendant la conduite ou l'arret d'un vehicule

Country Status (8)

Country Link
EP (1) EP0550701B1 (fr)
JP (1) JP3218244B2 (fr)
AU (1) AU671583B2 (fr)
CA (1) CA2080232A1 (fr)
DE (1) DE69214619T2 (fr)
ES (1) ES2095458T3 (fr)
GR (1) GR910100069A (fr)
WO (1) WO1992013730A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
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EP0711229A1 (fr) * 1993-08-03 1996-05-15 McLAUGHLIN ELECTRONICS Procede et systeme de controle d'un parametre d'un pneu de vehicule
US5531109A (en) * 1992-10-07 1996-07-02 Tsagas; Nicolaos Indicator of the air pressure in the pneumatic tires of a vehicle based on a capacitive coupling
WO2000021764A1 (fr) * 1998-10-15 2000-04-20 Nicolaos Tsagas Indicateur de pression d'air pour pneu de vehicule
US6609419B1 (en) 1999-02-11 2003-08-26 Emtop Limited Signal transmission in a tire pressure sensing system
WO2017046404A1 (fr) * 2015-09-17 2017-03-23 Safran Electronics & Defense Dispositif de mesure et systeme de mesure d'une pression comprenant un tel capteur

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US3249916A (en) * 1963-03-07 1966-05-03 Gen Motors Corp Tire condition monitoring system
US4283707A (en) * 1979-07-12 1981-08-11 The Boeing Company Aircraft low pressure tire warning system having comparator circuit for each axle pair of a four wheel bogie configuration
EP0087138A1 (fr) * 1982-02-19 1983-08-31 Hitachi, Ltd. Système d'alimentation pour éléments de véhicule munis d'un composant rotatif
GB2122757A (en) * 1982-07-05 1984-01-18 Labinal Measuring a parameter of a pneumatic tyre on a motor vehicle
EP0345199A2 (fr) * 1988-04-06 1989-12-06 Nikolaos Tsagas Dispositif pour indiquer en cours de route ou à l'arrêt, sur le tableau de bord, à l'intérieur du compartiment de conduite d'un véhicule, les limites de pression minimales et maximales (seuils de sécurité haut et bas) des pneumatiques d'un véhicule

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US3249916A (en) * 1963-03-07 1966-05-03 Gen Motors Corp Tire condition monitoring system
US4283707A (en) * 1979-07-12 1981-08-11 The Boeing Company Aircraft low pressure tire warning system having comparator circuit for each axle pair of a four wheel bogie configuration
EP0087138A1 (fr) * 1982-02-19 1983-08-31 Hitachi, Ltd. Système d'alimentation pour éléments de véhicule munis d'un composant rotatif
GB2122757A (en) * 1982-07-05 1984-01-18 Labinal Measuring a parameter of a pneumatic tyre on a motor vehicle
EP0345199A2 (fr) * 1988-04-06 1989-12-06 Nikolaos Tsagas Dispositif pour indiquer en cours de route ou à l'arrêt, sur le tableau de bord, à l'intérieur du compartiment de conduite d'un véhicule, les limites de pression minimales et maximales (seuils de sécurité haut et bas) des pneumatiques d'un véhicule

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531109A (en) * 1992-10-07 1996-07-02 Tsagas; Nicolaos Indicator of the air pressure in the pneumatic tires of a vehicle based on a capacitive coupling
EP0711229A1 (fr) * 1993-08-03 1996-05-15 McLAUGHLIN ELECTRONICS Procede et systeme de controle d'un parametre d'un pneu de vehicule
EP0711229A4 (fr) * 1993-08-03 1996-11-06 Mclaughlin Electronics Procede et systeme de controle d'un parametre d'un pneu de vehicule
WO2000021764A1 (fr) * 1998-10-15 2000-04-20 Nicolaos Tsagas Indicateur de pression d'air pour pneu de vehicule
GR980100380A (el) * 1998-10-15 2000-06-30 Συσκευη για την ενδειξη υπερβασης του ανωτερου και κατωτερου οριου ασφαλειας πιεσης αερα στους ελαστικους τροχους ενος οχηματος
US6553820B1 (en) 1998-10-15 2003-04-29 Nicolaos Tsagas Air pressure indicator for a vehicle tyre
US6609419B1 (en) 1999-02-11 2003-08-26 Emtop Limited Signal transmission in a tire pressure sensing system
WO2017046404A1 (fr) * 2015-09-17 2017-03-23 Safran Electronics & Defense Dispositif de mesure et systeme de mesure d'une pression comprenant un tel capteur
FR3041430A1 (fr) * 2015-09-17 2017-03-24 Sagem Defense Securite Dispositif de mesure et systeme de mesure d'une pression comprenant un tel capteur
US11047757B2 (en) 2015-09-17 2021-06-29 Safran Electronics & Defense Device for measuring and system for measuring a pressure comprising a pressure sensor

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GR910100069A (el) 1993-01-25
DE69214619T2 (de) 1997-07-24
JP3218244B2 (ja) 2001-10-15
AU1220592A (en) 1992-09-07
EP0550701A1 (fr) 1993-07-14
AU671583B2 (en) 1996-09-05
JPH05505997A (ja) 1993-09-02
CA2080232A1 (fr) 1992-08-09
DE69214619D1 (de) 1996-11-21
EP0550701B1 (fr) 1996-10-16
ES2095458T3 (es) 1997-02-16

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